Cool-Power® PI33xx-x0 8 V to 36 VIN Cool-Power ZVS Buck Regulator Family Product Description Features & Benefits The PI33xx-x0 is a family of high efficiency, wide input range DC-DC ZVS-Buck regulators integrating controller, power switches, and support components all within a high density System-in-Package (SiP). The integration of a high performance Zero-Voltage Switching (ZVS) topology, within the PI33xx-x0 series, increases point of load performance providing best in class power efficiency. The PI33xx-x0 requires only an external inductor and minimal capacitors to form a complete DC-DC switching mode Buck Regulator. • High Efficiency ZVS-Buck Topology Device • Wide input voltage range of 8V to 36V • Very-Fast transient response • High accuracy pre-trimmed output voltage • User adjustable soft-start & tracking • Power-up into pre-biased load (select versions) • Parallel capable with single wire current sharing • Input Over/Undervoltage Lockout (OVLO/UVLO) • Output Overvoltage Protection (OVP) Output Voltage IOUT Max • Overtemperature Protection (OTP) Set Range PI3311-x0-LGIZ 1.0 V 1.0 to 1.4 V 10 A PI3318-x0-LGIZ 1.8 V 1.4 to 2.0 V 10 A PI3312-x0-LGIZ 2.5 V 2.0 to 3.1 V 10 A ■ VOUT margining PI3301-x0-LGIZ 3.3 V 2.3 to 4.1 V 10 A ■ Fault reporting PI3302-x0-LGIZ 5.0 V 3.3 to 6.5 V 10 A ■ Enable and SYNCI pin polarity PI3303-x0-LGIZ 12 V 6.5 to 13.0 V 8A ■ Phase delay (interleaving multiple regulators) PI3305-x0-LGIZ 15 V 10.0 to 16.0 V 8A The ZVS architecture also enables high frequency operation while minimizing switching losses and maximizing efficiency. The high switching frequencyoperation reduces the size of the external filtering components, improves power density, and enables very fast dynamic response to line and load transients. The PI33xx-x0 series sustains high switching frequency all the way up to the rated input voltage without sacrificing efficiency and, with its 20 ns minimum on-time, supports large step down conversions up to 36 Vin. *I2C is a trademark of NXP Semiconductors • Fast and slow current limits • -40°C to 125°C operating range (TJ) • Optional I2C functionality & programmability: Applications • Rugged, defense applications • High efficiency systems • High voltage battery operation Package Information • 10 mm x 14 mm x 2.6 mm LGA SiP Cool-Power® Rev 1.8 vicorpower.com Page 1 of 41 09/2015 800 927.9474 PI33xx-x0 Contents Contents Page Contents Application Description Page 34 Order Information 3 Absolute Maximum Ratings 4 Output Voltage Trim 34 Block Diagram 4 Soft-Start Adjust and Tracking 35 Pin Description 5 Inductor Pairing 36 Package Pin-Out 5 Thermal Derating 36 PI3311-x0 (1.0 VOUT) Electrical Characteristics 6 Filter Considerations 36 PI3318-x0 (1.8 VOUT) Electrical Characteristics 9 Layout Guidelines 37 PI3312-x0 (2.5 VOUT) Electrical Characteristics 12 Recommended PCB Footprint and Stencil 38 PI3301-x0 (3.3 VOUT) Electrical Characteristics 16 Package Drawings 39 PI3302-x0 (5.0 VOUT) Electrical Characteristics 20 Revision History 40 PI3303-x0 (12.0 VOUT) Electrical Characteristics 24 Warranty 41 PI3305-x0 (15.0 VOUT) Electrical Characteristics 28 Functional Description 32 ENABLE (EN) 32 Remote Sensing 32 Switching Frequency Synchronization 32 Soft-Start 32 Output Voltage Trim 32 Output Current Limit Protection 33 Input Undervoltage Lockout 33 Input Overvoltage Lockout 33 Output Overvoltage Protection 33 Overtemperature Protection 33 Pulse Skip Mode (PSM) 33 Variable Frequency Operation 33 Parallel Operation 33 I2C Interface Operation 34 Cool-Power® Rev 1.8 vicorpower.com Page 2 of 41 09/2015 800 927.9474 PI33xx-x0 Order Information Cool-Power Output Range IOUT Max Package Transport Media Set Range PI3311-00-LGIZ 1.0 V 1.0 to 1.4 V 10 A 10 mm x 14 mm 123-pin LGA TRAY PI3318-00-LGIZ 1.8 V 1.4 to 2.0 V 10 A 10 mm x 14 mm 123-pin LGA TRAY PI3312-00-LGIZ 2.5 V 2.0 to 3.1 V 10 A 10 mm x 14 mm 123-pin LGA TRAY PI3301-00-LGIZ 3.3 V 2.3 to 4.1 V 10 A 10 mm x 14 mm 123-pin LGA TRAY PI3302-00-LGIZ 5.0 V 3.3 to 6.5 V 10 A 10 mm x 14 mm 123-pin LGA TRAY PI3303-00-LGIZ 12 V 6.5 to 13.0 V 8A 10 mm x 14 mm 123-pin LGA TRAY PI3305-00-LGIZ 15 V 10.0 to 16.0 V 8A 10 mm x 14 mm 123-pin LGA TRAY IOUT Max Package I2C Functionality & Programmability Cool-Power Output Range Transport Media Set Range PI3311-20-LGIZ 1.0 V 1.0 to 1.4 V 10 A 10 mm x 14 mm 123-pin LGA TRAY PI3318-20-LGIZ 1.8 V 1.4 to 2.0 V 10 A 10 mm x 14 mm 123-pin LGA TRAY PI3312-20-LGIZ 2.5 V 2.0 to 3.1 V 10 A 10 mm x 14 mm 123-pin LGA TRAY PI3301-20-LGIZ 3.3 V 2.3 to 4.1 V 10 A 10 mm x 14 mm 123-pin LGA TRAY PI3302-20-LGIZ 5.0 V 3.3 to 6.5 V 10 A 10 mm x 14 mm 123-pin LGA TRAY PI3303-20-LGIZ 12 V 6.5 to 13.0 V 8A 10 mm x 14 mm 123-pin LGA TRAY PI3305-20-LGIZ 15 V 10.0 to 16.0 V 8A 10 mm x 14 mm 123-pin LGA TRAY Cool-Power® Rev 1.8 vicorpower.com Page 3 of 41 09/2015 800 927.9474 PI33xx-x0 Absolute Maximum Ratings Name Rating VIN -0.7 V to 36 V VS1 -0.7 to 36 V, -4 V for 5 ns SGND 100 mA PGD, SYNCO, SYNCI, EN, EAO, ADJ, TRK, ADR1, ADR2, SCL, SDA, REM -0.3 V to 5.5 V / 5 mA VOUT PI3311-x0-LGMZ -0.3 V to 5.5 V PI3318-x0-LGMZ -0.5 V to 9 V PI3312-x0-LGMZ -0.8 V to 13 V PI3301-x0-LGMZ -1.0 V to 18 V PI3302-x0-LGMZ -1.5 V to 21 V PI3303-x0-LGMZ -3.6 V to 25 V PI3305-x0-LGMZ -4.5 V to 25 V Storage Temperature -65°C to 150°C Operating Junction Temperature -55°C to 125°C Soldering Temperature for 20 seconds 245°C ESD Rating 2 kV HBM Notes: At 25°C ambient temperature. Stresses beyond these limits may cause permanent damage to the device. Operation at these conditions or conditions beyond those listed in the Electrical Specifications table is not guaranteed. All voltage nodes are referenced to PGND unless otherwise noted. Test conditions are per the specifications within the individual product electrical characteristics.. Functional Block Diagram Simplified Block Diagram (I2C pins SCL, SDA, ADR0, and ADR1 only active for PI33xx-20 device versions) Cool-Power® Rev 1.8 vicorpower.com Page 4 of 41 09/2015 800 927.9474 PI33xx-x0 Pin Description Pin Name Number SGND Block 1 Description Signal Ground: Internal logic ground for EA, TRK, SYNCI, SYNCO, ADJ and I2C (options) communication returns. SGND and PGND are star connected within the regulator package. PGND Block 2 Power Ground: VIN and VOUT power returns VIN Block 3 Input Voltage: and sense for UVLO, OVLO and feed forward ramp VOUT Block 5 Output Voltage: and sense for power switches and feed-forward ramp VS1 Block 4 Switching Node: and ZVS sense for power switches PGD A1 Parallel Good: Used for parallel timing management intended for lead regulator. EAO A2 Error Amp Output: External connection for additional compensation and current sharing. EN A3 Enable Input: Regulator enable control. Asserted high or left floating – regulator enabled; Asserted low, regulator output disabled. Polarity is programmable via I2C interface. REM A5 ADJ B1 Remote Sense: High side connection. Connect to output regulation point. Adjust Input: An external resistor may be connected between ADJ pin and SGND or VOUT to trim the output voltage up or down. TRK Soft-start and Track Input: An external capacitor may be connected between TRK pin C1 and SGND to decrease the rate of rise during soft-start. NC K3, A4 SYNCO K4 SYNCI K5 No Connect: Leave pins floating. Synchronization Output: Outputs a low signal for ½ of the minimum period for synchronization of other converters. Synchronization Input: Synchronize to the falling edge of external clock frequency. SYNCI is a high impedance digital input node and should always be connected to SGND when not in use. SDA D1 Data Line: Connect to SGND for PI33xx-00. For use with PI33xx-20 only. SCL E1 Clock Line: Connect to SGND for PI33xx-00. For use with PI33xx-20 only. ADR1 H1 Tri-state Address: No connect for PI33xx-00. For use with PI33xx-20 only. ADR0 G1 Tri-state Address: No connect for PI33xx-00. For use with PI33xx-20 only. SYNCO 2 SYNCI 1 NC Package Pin-Out 3 4 5 6 7 PGND Block 2 8 9 10 11 12 SGND K Block 1 J 13 14 VIN Block 3 Block 1: B2-4, C2-4, D2-3, E2-3, F1-3, G2-3, H2-3, J1-3, K1-2 Block 2: A8-10, B8-10, C8-10, D8-10, E4-10, ADR1 H F4-10, G4-10, H4-10, J4-10, K6-10 ADR0 G SGND F SCL E Block 3: G12-14, H12-14, J12-14, K12-14 Block 4: A12-14, B12-14, C12-14, D12-14, E12-14 Block 5: A6-7, B6-7, C6-7, D6-7 SDA D TRK C VS1 Block 4 ADJ B PGD A REM NC EN EAO VOUT Block 5 Cool-Power® Rev 1.8 vicorpower.com Page 5 of 41 09/2015 800 927.9474 PI33xx-x0 PI3311-x0-LGIZ (1.0 VOUT) Electrical Characteristics Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 125 nH [1] Parameter Input Voltage Input Current Input Current At Output Short (fault condition duty cycle) Symbol VIN_DC IIN_DC IIN_Short Input Quiescent Current IQ_VIN Input Voltage Slew Rate VIN_SR Output Voltage Total Regulation Output Voltage Trim Range Line Regulation Load Regulation Output Voltage Ripple Continuous Output Current Range Current Limit Conditions Input Specifications Minimum 1 mA load required VIN = 24 V, TC = 25°C, IOUT =10 A Min Typ Max Unit 8 24 476 36 V mA 20 mA 1 mA mA V/µs [2] Disabled Enabled (no load) 2.0 2.5 Output Specifications [2] VOUT_DC [3] VOUT_DC VOUT (VIN) @25°C, 8 V <VIN <36 V VOUT (IOUT) @25°C, 0.5 A <IOUT <10 A VOUT_AC IOUT = 5 A, COUT = 8 x 100 µF, 20 MHz BW [4] [5] IOUT_DC Min 1 mA load required IOUT_CL Protection VIN UVLO Start Threshold VUVLO_START VIN UVLO Stop Threshold VUVLO_STOP VIN UVLO Hysteresis VUVLO_HYS VIN OVLO Start Threshold VOVLO_START VIN OVLO Stop Threshold VOVLO_STOP VIN OVLO Hysteresis VOVLO_HYS VIN UVLO/OVLO Fault Delay Time tf_DLY Number of the switching freq cycles VIN UVLO/OVLO Response Time tf Output Overvoltage Protection VOVP Above VOUT Over-Temperature Fault Threshold TOTP Over-Temperature Restart Hysteresis TOTP_HYS 0.987 1.0 1.0 1.013 1.4 0.10 0.10 20 10 12 7.10 6.80 37.0 36.1 130 7.60 7.25 0.33 38.4 0.77 128 500 20 135 30 8.00 7.60 140 V V % % mVp-p A A V V V V V V Cycles ns % °C °C [1] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4” dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. [2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [4] Refer to Output Ripple plots. [5] Refer to Load Current vs. Ambient Temperature curves. [6] Refer to Switching Frequency vs. Load current curves Cool-Power® Rev 1.8 vicorpower.com Page 6 of 41 09/2015 800 927.9474 PI33xx-x0 PI3311-x0-LGIZ (1.0 VOUT) Electrical Characteristics Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 125 nH [1] Parameter Symbol Conditions Min Typ Max Unit Timing Switching Frequency fS Fault Restart Delay tFR_DLY Synchronization Frequency Range SYNCI Threshold fSYNCI VSYNCI [6] Sync In (SYNCI) Relative to set switching frequency [3] 500 kHz 30 ms 50 110 2.5 % V Sync Out (SYNCO) SYNCO High SYNCO Low SYNCO Rise Time SYNCO Fall Time TRK Active Input Range TRK Max Output Voltage TRK Disable Threshold Charge Current (Soft – Start) Discharge Current (Fault) Soft-Start Time VSYNCO_HI VSYNCO_LO tSYNCO_RT tSYNCO_FT VTRK VTRK_OV ITRK ITRK_DIS tSS Source 1 mA Sink 1 mA 20 pF load 20 pF load 4.5 0.5 10 10 Soft Start And Tracking Internal reference tracking range 0 20 -70 CTRK = 0 uF 1.04 1.2 40 -50 6.8 2.2 V V ns ns 60 -30 V V mV µA mA ms 1.1 0.9 300 V V mV Enable High Threshold Low Threshold Threshold Hysteresis Enable Pull-Up Voltage (floating, unfaulted) Enable Pull-Down Voltage (floating, faulted) Source Current Sink Current VEN_HI VEN_LO VEN_HYS 0.9 0.7 100 1 0.8 200 VEN_PU 2 V VEN_PD 0 V IEN_SO IEN_SK -50 50 uA uA [1] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4” dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. [2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [4] Refer to Output Ripple plots. [5] Refer to Load Current vs. Ambient Temperature curves. [6] Refer to Switching Frequency vs. Load current curves Cool-Power® Rev 1.8 vicorpower.com Page 7 of 41 09/2015 800 927.9474 PI33xx-x0 PI3311-x0-LGIZ (1.0 VOUT) Electrical Characteristics Efficiency at 25°C 100 95 Efficiency 90 85 12 Vin 24 Vin 36 Vin 80 75 70 65 60 55 50 0 1 2 3 4 5 6 7 8 9 10 Load Curent (A) Figure 1 — Efficiency at 25°C Figure 4 — Transient Response 2 A to 7 A, at 5 A/µs Figure 2 — Short Circuit Test Figure 5 — Output Ripple 24 VIN, 1.0 VOUT at 10 A Switching Frequency vs. Load Current 600 Frequency (kHz) 500 400 12 Vin 24 Vin 36 Vin 300 200 100 0 1 2 3 4 5 6 7 8 9 10 Load Curent (A) Figure 3 — Switching Frequency vs. Load Current Figure 6 — Output Ripple 24 VIN, 1.0 VOUT at 5 A Cool-Power® Rev 1.8 vicorpower.com Page 8 of 41 09/2015 800 927.9474 PI33xx-x0 PI3318-x0-LGIZ (1.8 VOUT) Electrical Characteristics Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 155 nH [1] Parameter Input Voltage Input Current Input Current At Output Short (fault condition duty cycle) Symbol VIN_DC IIN_DC IIN_Short Input Quiescent Current IQ_VIN Input Voltage Slew Rate VIN_SR Conditions Input Specifications Minimum 1 mA load required VIN = 24 V, TC = 25°C, IOUT =10 A Typ Max Unit 8 24 835 36 V mA 20 mA 1 mA mA V/µs [2] Disabled Enabled (no load) 2.0 2.5 Output Voltage Total Regulation Output Voltage Trim Range Line Regulation Load Regulation Output Voltage Ripple Continuous Output Current Range Current Limit Output Specifications [2] VOUT_DC [3] VOUT_DC VOUT (VIN) @25°C, 8 V <VIN <36 V VOUT (IOUT) @25°C, 0.5 A <IOUT <10 A VOUT_AC IOUT = 5 A, COUT = 6 x 100 µF, 20 MHz BW [4] [5] IOUT_DC IOUT_CL VIN UVLO Start Threshold VIN UVLO Stop Threshold VIN UVLO Hysteresis VIN OVLO Start Threshold VIN OVLO Stop Threshold VIN OVLO Hysteresis VIN UVLO/OVLO Fault Delay Time VIN UVLO/OVLO Response Time Output Overvoltage Protection Protection VUVLO_START VUVLO_STOP VUVLO_HYS VOVLO_START VOVLO_STOP VOVLO_HYS tf_DLY Number of the switching freq cycles tf VOVP Above VOUT Over-Temperature Fault Threshold Over-Temperature Restart Hysteresis Min TOTP TOTP_HYS 1.773 1.4 1.8 1.827 2.0 0.10 0.10 25 10 12 7.10 6.80 37.0 36.1 7.60 7.25 0.33 38.4 8.00 7.60 V V V V V V Cycles ns % 140 °C °C 0.77 128 500 20 130 135 30 V V % % mVp-p A A [1] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4” dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. [2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [4] Refer to Output Ripple plots. [5] Refer to Load Current vs. Ambient Temperature curves. [6] Refer to Switching Frequency vs. Load current curves. Cool-Power® Rev 1.8 vicorpower.com Page 9 of 41 09/2015 800 927.9474 PI33xx-x0 PI3318-x0-LGIZ (1.8 VOUT) Electrical Characteristics Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 155 nH [1] Parameter Symbol Conditions Min Typ Max Unit Timing Switching Frequency Fault Restart Delay fS tFR_DLY Synchronization Frequency Range SYNCI Threshold fSYNCI VSYNCI [6] 600 30 Sync In (SYNCI) Relative to set switching frequency [3] 50 kHz ms 110 2.5 % V Sync Out (SYNCO) SYNCO High SYNCO Low SYNCO Rise Time SYNCO Fall Time VSYNCO_HI VSYNCO_LO tSYNCO_RT tSYNCO_FT Source 1 mA Sink 1 mA 20 pF load 20 pF load 4.5 0.5 10 10 V V ns ns Soft Start And Tracking TRK Active Input Range TRK Max Output Voltage TRK Disable Threshold Charge Current (Soft – Start) Discharge Current (Fault) Soft-Start Time VTRK VTRK_OV ITRK ITRK_DIS tSS 0 20 -70 CTRK = 0 uF 1.04 1.2 40 -50 6.8 2.2 60 -30 V V mV µA mA ms 1.1 0.9 300 V V mV Enable High Threshold Low Threshold Threshold Hysteresis Enable Pull-Up Voltage (floating, unfaulted) Enable Pull-Down Voltage (floating, faulted) Source Current Sink Current VEN_HI VEN_LO VEN_HYS 0.9 0.7 100 1 0.8 200 VEN_PU 2 V VEN_PD 0 V IEN_SO IEN_SK -50 50 uA uA [1] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4” dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. [2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [4] Refer to Output Ripple plots. [5] Refer to Load Current vs. Ambient Temperature curves. [6] Refer to Switching Frequency vs. Load current curves. Cool-Power® Rev 1.8 vicorpower.com Page 10 of 41 09/2015 800 927.9474 PI33xx-x0 PI3318-x0-LGIZ (1.8 VOUT) Electrical Characteristics Efficiency at 25°C 100 95 Efficiency 90 85 8 Vin 12 Vin 24 Vin 36 Vin 80 75 70 65 60 55 50 0 1 2 3 4 5 6 7 8 9 10 Load Curent (A) Figure 7 — Efficiency at 25°C Figure 10 — Transient Response 2 A to 7 A, at 5 A/µs Figure 8 — Short Circuit Test Figure 11 — Output Ripple 24 VIN, 1.8 VOUT at 10 A Switching Frequency vs. Load Current 700 Frequency (kHz) 600 500 8 Vin 12 Vin 24 Vin 36 Vin 400 300 200 100 0 1 2 3 4 5 6 7 8 9 10 Load Curent (A) Figure 9 — Switching Frequency vs. Load Current Figure 12 — Output Ripple 24 VIN, 1.8 VOUT at 5 A Cool-Power® Rev 1.8 vicorpower.com Page 11 of 41 09/2015 800 927.9474 PI33xx-x0 PI3312-x0-LGIZ (2.5 VOUT) Electrical Characteristics Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 200 nH [1] Parameter Symbol Conditions Min Typ Max Unit 8 24 1.14 36 V mA 20 mA 1 mA mA V/µs Input Specifications Input Voltage Input Current Input Current At Output Short (fault condition duty cycle) VIN_DC IIN_DC [7] IIN_Short [2] Input Quiescent Current IQ_VIN Input Voltage Slew Rate VIN_SR Output Voltage Total Regulation Output Voltage Trim Range Line Regulation Load Regulation Output Voltage Ripple Continuous Output Current Range Current Limit VIN = 24 V, TC = 25°C, IOUT =10 A Disabled Enabled (no load) 2.0 2.5 Output Specifications [2] VOUT_DC [3] [7] VOUT_DC VOUT (VIN) @25°C, 8 V <VIN <36 V VOUT (IOUT) @25°C, 0.5 A <IOUT <10 A VOUT_AC IOUT = 5 A, COUT = 4 x 100 µF, 20 MHz BW [4] [5] [7] IOUT_DC IOUT_CL Protection VIN UVLO Start Threshold VUVLO_START VIN UVLO Stop Threshold VUVLO_STOP VIN UVLO Hysteresis VUVLO_HYS VIN OVLO Start Threshold VOVLO_START VIN OVLO Stop Threshold VOVLO_STOP VIN OVLO Hysteresis VOVLO_HYS VIN UVLO/OVLO Fault Delay Time tf_DLY Number of the switching freq cycles VIN UVLO/OVLO Response Time tf Output Overvoltage Protection VOVP Above VOUT Over-Temperature Fault Threshold TOTP Over-Temperature Restart Hysteresis TOTP_HYS 1.773 2.0 1.8 2.5 0.10 0.10 28 1.827 3.1 10 12 7.10 6.80 37.0 36.1 130 7.60 7.25 0.33 38.4 0.77 128 500 20 135 30 8.00 7.60 140 V V % % mVp-p A A V V V V V V Cycles ns % °C °C [1] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4” dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. [2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [4] Refer to Output Ripple plots. [5] Refer to Load Current vs. Ambient Temperature curves. [6] Refer to Switching Frequency vs. Load current curves. [7] Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required. Cool-Power® Rev 1.8 vicorpower.com Page 12 of 41 09/2015 800 927.9474 PI33xx-x0 PI3312-x0-LGIZ (2.5 VOUT) Electrical Characteristics Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 200 nH [1] Parameter Symbol Conditions Min Typ Max Unit Timing Switching Frequency Fault Restart Delay fS tFR_DLY Synchronization Frequency Range SYNCI Threshold fSYNCI VSYNCI [6] 500 30 Sync In (SYNCI) Relative to set switching frequency [3] 50 kHz ms 110 2.5 % V Sync Out (SYNCO) SYNCO High SYNCO Low SYNCO Rise Time SYNCO Fall Time VSYNCO_HI VSYNCO_LO tSYNCO_RT tSYNCO_FT Source 1 mA Sink 1 mA 20 pF load 20 pF load 4.5 0.5 10 10 V V ns ns Soft Start And Tracking TRK Active Input Range TRK Max Output Voltage TRK Disable Threshold Charge Current (Soft – Start) Discharge Current (Fault) Soft-Start Time VTRK VTRK_OV ITRK ITRK_DIS tSS 0 20 -70 CTRK = 0 uF 1.04 1.2 40 -50 6.8 2.2 60 -30 V V mV µA mA ms 1.1 0.9 300 V V mV Enable High Threshold Low Threshold Threshold Hysteresis Enable Pull-Up Voltage (floating, unfaulted) Enable Pull-Down Voltage (floating, faulted) Source Current Sink Current VEN_HI VEN_LO VEN_HYS 0.9 0.7 100 1 0.8 200 VEN_PU 2 V VEN_PD 0 V IEN_SO IEN_SK -50 50 uA uA [1] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4” dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. [2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [4] Refer to Output Ripple plots. [5] Refer to Load Current vs. Ambient Temperature curves. [6] Refer to Switching Frequency vs. Load current curves. [7] Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required. Cool-Power® Rev 1.8 vicorpower.com Page 13 of 41 09/2015 800 927.9474 PI33xx-x0 PI3312-x0-LGIZ (2.5 VOUT) Electrical Characteristics Efficiency at 25°C 95 90 Efficiency 85 80 12 Vin 24 Vin 36 Vin 75 70 65 60 55 50 0 1 2 3 4 5 6 7 8 9 10 Load Curent (A) Figure 13 — Efficiency at 25°C Figure 16 — Transient Response 5 A to 10 A, at 5 A/µs Figure 14 — Short Circuit Test Figure 17 — Output Ripple 24 VIN, 2.5 VOUT at 10 A Switching Frequency vs. Load Current 600 Frequency (kHz) 500 400 12 Vin 24 Vin 36 Vin 300 200 100 0 1 2 3 4 5 6 7 8 9 10 Load Curent (A) Figure 15 — Switching Frequency vs. Load Current Figure 18 — Output Ripple 24 VIN, 2.5 VOUT at 5 A Cool-Power® Rev 1.8 vicorpower.com Page 14 of 41 09/2015 800 927.9474 PI33xx-x0 PI3312-x0-LGIZ (2.5 VOUT) Electrical Characteristics Load Current vs. Ambient Temperature, 0 LFM 12 Load Current (A) 10 8 36 Vin 24 Vin 8 Vin 6 4 2 0 50 75 100 125 Ambient Temperature (°C) Figure 19 — Load Current vs. Ambient Temperature, 0 LFM Load Current vs. Ambient Temperature, 200 LFM 12 Load Current (A) 10 8 36 Vin 24 Vin 8 Vin 6 4 2 0 50 75 100 125 Ambient Temperature (°C) Figure 20 — Load Current vs. Ambient Temperature, 400 LFM Load Current vs. Ambient Temperature, 400 LFM 12 Load Current (A) 10 8 36 Vin 24 Vin 8 Vin 6 4 2 0 50 75 100 125 Ambient Temperature (°C) Figure 21 — Load Current vs. Ambient Temperature, 200 LFM Cool-Power® Rev 1.8 vicorpower.com Page 15 of 41 09/2015 800 927.9474 PI33xx-x0 PI3301-x0-LGIZ (3.3 VOUT) Electrical Characteristics Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 200 nH [1] Parameter Symbol Conditions Min Typ Max Unit 8 24 1.49 36 V mA 20 mA 1 mA mA V/µs Input Specifications Input Voltage Input Current Input Current At Output Short (fault condition duty cycle) VIN_DC IIN_DC [7] IIN_Short [2] Input Quiescent Current IQ_VIN Input Voltage Slew Rate VIN_SR Output Voltage Total Regulation Output Voltage Trim Range Line Regulation Load Regulation Output Voltage Ripple Continuous Output Current Range Current Limit VIN = 24 V, TC = 25°C, IOUT =10 A Disabled Enabled (no load) 2.0 2.5 Output Specifications [2] VOUT_DC [3] [7] VOUT_DC VOUT (VIN) @25°C, 8 V <VIN <36 V VOUT (IOUT) @25°C, 0.5 A <IOUT <10 A VOUT_AC IOUT = 5 A, COUT = 4 x 100 µF, 20 MHz BW [4] IOUT_DC IOUT_CL Protection VIN UVLO Start Threshold VUVLO_START VIN UVLO Stop Threshold VUVLO_STOP VIN UVLO Hysteresis VUVLO_HYS VIN OVLO Start Threshold VOVLO_START VIN OVLO Stop Threshold VOVLO_STOP VIN OVLO Hysteresis VOVLO_HYS VIN UVLO/OVLO Fault Delay Time tf_DLY Number of the switching freq cycles VIN UVLO/OVLO Response Time tf Output Overvoltage Protection VOVP Above VOUT Over-Temperature Fault Threshold TOTP Over-Temperature Restart Hysteresis TOTP_HYS 3.25 2.3 3.30 3.3 0.10 0.10 37.5 3.36 4.1 10 12 7.10 6.80 37.0 36.1 130 7.60 7.25 0.33 38.4 0.77 128 500 20 135 30 8.00 7.60 140 V V % % mVp-p A A V V V V V V Cycles ns % °C °C [1] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4” dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. [2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [4] Refer to Output Ripple plots. [5] Refer to Load Current vs. Ambient Temperature curves. [6] Refer to Switching Frequency vs. Load current curves. [7] Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required. Cool-Power® Rev 1.8 vicorpower.com Page 16 of 41 09/2015 800 927.9474 PI33xx-x0 PI3301-x0-LGIZ (3.3 VOUT) Electrical Characteristics Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 200 nH [1] Parameter Symbol Conditions Min Typ Max Unit Timing Switching Frequency Fault Restart Delay fS tFR_DLY Synchronization Frequency Range SYNCI Threshold fSYNCI VSYNCI [6] 650 30 Sync In (SYNCI) Relative to set switching frequency [3] 50 kHz ms 110 2.5 % V Sync Out (SYNCO) SYNCO High SYNCO Low SYNCO Rise Time SYNCO Fall Time VSYNCO_HI VSYNCO_LO tSYNCO_RT tSYNCO_FT Source 1 mA Sink 1 mA 20 pF load 20 pF load 4.5 0.5 10 10 V V ns ns Soft Start And Tracking TRK Active Input Range TRK Max Output Voltage TRK Disable Threshold Charge Current (Soft – Start) Discharge Current (Fault) Soft-Start Time VTRK VTRK_OV ITRK ITRK_DIS tSS 0 20 -70 CTRK = 0 uF 1.04 1.2 40 -50 6.8 2.2 60 -30 V V mV µA mA ms 1.1 0.9 300 V V mV Enable High Threshold Low Threshold Threshold Hysteresis Enable Pull-Up Voltage (floating, unfaulted) Enable Pull-Down Voltage (floating, faulted) Source Current Sink Current VEN_HI VEN_LO VEN_HYS 0.9 0.7 100 1 0.8 200 VEN_PU 2 V VEN_PD 0 V IEN_SO IEN_SK -50 50 uA uA [1] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4” dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. [2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [4] Refer to Output Ripple plots. [5] Refer to Load Current vs. Ambient Temperature curves. [6] Refer to Switching Frequency vs. Load current curves. [7] Minimum 5 V between Vin-VOUT must be maintained or a minimum load of 1mA required. Cool-Power® Rev 1.8 vicorpower.com Page 17 of 41 09/2015 800 927.9474 PI33xx-x0 PI3301-x0-LGIZ (3.3 VOUT) Electrical Characteristics Efficiency at 25°C 100 95 Efficiency 90 85 12 Vin 24 Vin 36 Vin 80 75 70 65 60 55 50 0 1 2 3 4 5 6 7 8 9 10 Load Curent (A) Figure 22 — Efficiency at 25°C Figure 25 — Transient Response 5 A to 10 A, at 5 A/µs Figure 23 — Short Circuit Test Figure 26 — Output Ripple 24 VIN, 2.5 VOUT at 10 A Switching Frequency vs. Load Current 700 Frequency (kHz) 600 500 12 Vin 24 Vin 36 Vin 400 300 200 100 0 1 2 3 4 5 6 7 8 9 10 Load Curent (A) Figure 24 — Switching Frequency vs. Load Current Figure 27 — Output Ripple 24 VIN, 2.5 VOUT at 5 A Cool-Power® Rev 1.8 vicorpower.com Page 18 of 41 09/2015 800 927.9474 PI33xx-x0 PI3301-x0-LGIZ (3.3 VOUT) Electrical Characteristics Load Current vs. Ambient Temperature, 0 LFM 12 Load Current (A) 10 8 36 Vin 24 Vin 8 Vin 6 4 2 0 50 75 100 125 Ambient Temperature (°C) Figure 28 — Load Current vs. Ambient Temperature, 0 LFM Load Current vs. Ambient Temperature, 200 LFM 12 Load Current (A) 10 8 36 Vin 24 Vin 8 Vin 6 4 2 0 50 75 100 125 Ambient Temperature (°C) Figure 29 — Load Current vs. Ambient Temperature, 400 LFM Load Current vs. Ambient Temperature, 400 LFM 12 Load Current (A) 10 8 36 Vin 24 Vin 8 Vin 6 4 2 0 50 75 100 125 Ambient Temperature (°C) Figure 30 — Load Current vs. Ambient Temperature, 200 LFM Cool-Power® Rev 1.8 vicorpower.com Page 19 of 41 09/2015 800 927.9474 PI33xx-x0 PI3302-x0-LGIZ (5.0 VOUT) Electrical Characteristics Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 200 nH [1] Parameter Symbol Conditions Min Typ Max Unit 8 24 2.23 36 V mA 20 mA 1 mA mA V/µs Input Specifications Input Voltage Input Current Input Current At Output Short (fault condition duty cycle) VIN_DC IIN_DC [7] IIN_Short [2] Input Quiescent Current IQ_VIN Input Voltage Slew Rate VIN_SR Output Voltage Total Regulation Output Voltage Trim Range Line Regulation Load Regulation Output Voltage Ripple Continuous Output Current Range Current Limit VIN = 24 V, TC = 25°C, IOUT =10 A Disabled Enabled (no load) 2.0 2.5 Output Specifications [2] VOUT_DC [3] [7] VOUT_DC VOUT (VIN) @25°C, 8 V <VIN <36 V VOUT (IOUT) @25°C, 0.5 A <IOUT <10 A VOUT_AC IOUT = 5 A, COUT = 4 x 47 µF, 20 MHz BW [4] [5] [7] IOUT_DC IOUT_CL Protection VIN UVLO Start Threshold VUVLO_START VIN UVLO Stop Threshold VUVLO_STOP VIN UVLO Hysteresis VUVLO_HYS VIN OVLO Start Threshold VOVLO_START VIN OVLO Stop Threshold VOVLO_STOP VIN OVLO Hysteresis VOVLO_HYS VIN UVLO/OVLO Fault Delay Time tf_DLY Number of the switching freq cycles VIN UVLO/OVLO Response Time tf Output Overvoltage Protection VOVP Above VOUT Over-Temperature Fault Threshold TOTP Over-Temperature Restart Hysteresis TOTP_HYS 4.93 3.3 5.00 5.07 6.5 0.10 0.10 30 10 12 7.10 6.80 37.0 36.1 130 7.60 7.25 0.33 38.4 0.77 128 500 20 135 30 8.00 7.60 140 V V % % mVp-p A A V V V V V V Cycles ns % °C °C [1] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4” dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. [2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [4] Refer to Output Ripple plots. [5] Refer to Load Current vs. Ambient Temperature curves. [6] Refer to Switching Frequency vs. Load current curves. [7] Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required. Cool-Power® Rev 1.8 vicorpower.com Page 20 of 41 09/2015 800 927.9474 PI33xx-x0 PI3302-x0-LGIZ (5.0 VOUT) Electrical Characteristics Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 200 nH [1] Parameter Symbol Conditions Min Typ Max Unit Timing Switching Frequency Fault Restart Delay fS tFR_DLY Synchronization Frequency Range SYNCI Threshold fSYNCI VSYNCI [6] 1.0 30 Sync In (SYNCI) Relative to set switching frequency [3] 50 MHz ms 110 2.5 % V Sync Out (SYNCO) SYNCO High SYNCO Low SYNCO Rise Time SYNCO Fall Time VSYNCO_HI VSYNCO_LO tSYNCO_RT tSYNCO_FT Source 1 mA Sink 1 mA 20 pF load 20 pF load 4.5 0.5 10 10 V V ns ns Soft Start And Tracking TRK Active Input Range TRK Max Output Voltage TRK Disable Threshold Charge Current (Soft – Start) Discharge Current (Fault) Soft-Start Time VTRK VTRK_OV ITRK ITRK_DIS tSS 0 20 -70 CTRK = 0 uF 1.04 1.2 40 -50 6.8 2.2 60 -30 V V mV µA mA ms 1.1 0.9 300 V V mV Enable High Threshold Low Threshold Threshold Hysteresis Enable Pull-Up Voltage (floating, unfaulted) Enable Pull-Down Voltage (floating, faulted) Source Current Sink Current VEN_HI VEN_LO VEN_HYS 0.9 0.7 100 1 0.8 200 VEN_PU 2 V VEN_PD 0 V IEN_SO IEN_SK -50 50 uA uA [1] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4” dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. [2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [4] Refer to Output Ripple plots. [5] Refer to Load Current vs. Ambient Temperature curves. [6] Refer to Switching Frequency vs. Load current curves. [7] Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required. Cool-Power® Rev 1.8 vicorpower.com Page 21 of 41 09/2015 800 927.9474 PI33xx-x0 PI3302-x0-LGIZ (5.0 VOUT) Electrical Characteristics Efficiency at 25°C 100 95 Efficiency 90 85 12 Vin 24 Vin 36 Vin 80 75 70 65 60 55 50 0 1 2 3 4 5 6 7 8 9 10 Load Curent (A) Figure 31 — Efficiency at 25°C Figure 34 — Transient Response 5 A to 10 A, at 5 A/µs Figure 32 — Short Circuit Test Figure 35 — Output Ripple 24 VIN, 2.5 VOUT at 10 A Switching Frequency vs. Load Current 1.2 Frequency (MHz) 1.0 0.8 12 Vin 24 Vin 36 Vin 0.6 0.4 0.2 0.0 1 2 3 4 5 6 7 8 9 10 Load Curent (A) Figure 33 — Switching Frequency vs. Load Current Figure 36 — Output Ripple 24 VIN, 2.5 VOUT at 5 A Cool-Power® Rev 1.8 vicorpower.com Page 22 of 41 09/2015 800 927.9474 PI33xx-x0 PI3302-x0-LGIZ (5.0 VOUT) Electrical Characteristics Load Current vs. Ambient Temperature, 0 LFM 12 Load Current (A) 10 8 36 Vin 24 Vin 8 Vin 6 4 2 0 50 75 100 125 Ambient Temperature (°C) Figure 37 — Load Current vs. Ambient Temperature, 0 LFM Load Current vs. Ambient Temperature, 200 LFM 12 Load Current (A) 10 8 36 Vin 24 Vin 8 Vin 6 4 2 0 50 75 100 125 Ambient Temperature (°C) Figure 38 — Load Current vs. Ambient Temperature, 400 LFM Load Current vs. Ambient Temperature, 400 LFM 12 Load Current (A) 10 8 36 Vin 24 Vin 8 Vin 6 4 2 0 50 75 100 125 Ambient Temperature (°C) Figure 39 — Load Current vs. Ambient Temperature, 200 LFM Cool-Power® Rev 1.8 vicorpower.com Page 23 of 41 09/2015 800 927.9474 PI33xx-x0 PI3303-x0-LGIZ (12.0 VOUT) Electrical Characteristics Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 230 nH [1] Parameter Symbol Conditions Min Typ Max Unit 17.4 24 4.15 36 V mA 20 mA 1 mA mA V/µs Input Specifications Input Voltage Input Current Input Current At Output Short (fault condition duty cycle) VIN_DC IIN_DC [7] IIN_Short [2] Input Quiescent Current IQ_VIN Input Voltage Slew Rate VIN_SR Output Voltage Total Regulation Output Voltage Trim Range Line Regulation Load Regulation Output Voltage Ripple Continuous Output Current Range Current Limit VIN = 24 V, TC = 25°C, IOUT = 8 A Disabled Enabled (no load) 2.0 2.5 Output Specifications [2] VOUT_DC [3][7] VOUT_DC VOUT (VIN) @25°C, 8 V <VIN <36 V VOUT (IOUT) @25°C, 0.5 A <IOUT <8 A VOUT_AC IOUT = 4 A, COUT = 4 x 22 µF, 20 MHz BW [4] [5] IOUT_DC IOUT_CL Protection VIN UVLO Start Threshold VUVLO_START VIN UVLO Stop Threshold VUVLO_STOP VIN UVLO Hysteresis VUVLO_HYS VIN OVLO Start Threshold VOVLO_START VIN OVLO Stop Threshold VOVLO_STOP VIN OVLO Hysteresis VOVLO_HYS VIN UVLO/OVLO Fault Delay Time tf_DLY Number of the switching freq cycles VIN UVLO/OVLO Response Time tf Output Overvoltage Protection VOVP Above VOUT Over-Temperature Fault Threshold TOTP Over-Temperature Restart Hysteresis TOTP_HYS 11.82 6.5 12.0 12 0.10 0.10 60 12.18 13.0 8 9 15.80 15.00 37.0 36.1 130 16.60 15.80 0.77 38.4 0.77 128 500 20 135 30 17.40 16.60 140 V V % % mVp-p A A V V V V V V Cycles ns % °C °C [1] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4” dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. [2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [4] Refer to Output Ripple plots. [5] Refer to Load Current vs. Ambient Temperature curves. [6] Refer to Switching Frequency vs. Load current curves. [7] Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required. Cool-Power® Rev 1.8 vicorpower.com Page 24 of 41 09/2015 800 927.9474 PI33xx-x0 PI3303-x0-LGIZ (12.0 VOUT) Electrical Characteristics Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 230 nH [1] Parameter Symbol Conditions Min Typ Max Unit Timing Switching Frequency Fault Restart Delay fS tFR_DLY Synchronization Frequency Range SYNCI Threshold fSYNCI VSYNCI [6] 1.4 30 Sync In (SYNCI) Relative to set switching frequency [3] 50 MHz ms 110 2.5 % V Sync Out (SYNCO) SYNCO High SYNCO Low SYNCO Rise Time VSYNCO_HI VSYNCO_LO tSYNCO_RT Source 1 mA Sink 1 mA 20 pF load SYNCO Fall Time tSYNCO_FT 20 pF load 4.5 10 V V ns 10 ns 0.5 Soft Start And Tracking TRK Active Input Range TRK Max Output Voltage TRK Disable Threshold Charge Current (Soft – Start) Discharge Current (Fault) Soft-Start Time VTRK VTRK_OV ITRK ITRK_DIS tSS 0 20 -70 CTRK = 0 uF 1.04 1.2 40 -50 6.8 2.2 60 -30 V V mV µA mA ms 1.1 0.9 300 V V mV Enable High Threshold Low Threshold Threshold Hysteresis Enable Pull-Up Voltage (floating, unfaulted) Enable Pull-Down Voltage (floating, faulted) Source Current Sink Current VEN_HI VEN_LO VEN_HYS 0.9 0.7 100 1 0.8 200 VEN_PU 2 V VEN_PD 0 V IEN_SO IEN_SK -50 50 uA uA [1] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4” dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. [2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [4] Refer to Output Ripple plots. [5] Refer to Load Current vs. Ambient Temperature curves. [6] Refer to Switching Frequency vs. Load current curves. [7] Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required. Cool-Power® Rev 1.8 vicorpower.com Page 25 of 41 09/2015 800 927.9474 PI33xx-x0 PI3303-x0-LGIZ (12.0 VOUT) Electrical Characteristics Efficiency at 25°C 100 95 Efficiency 90 85 17.4 Vin 24 Vin 36 Vin 80 75 70 65 60 55 50 0 1 2 3 4 5 6 7 8 Load Curent (A) Figure 40 — Efficiency at 25°C Figure 43 — Transient Response 5 A to 10 A, at 5 A/µs Figure 41 — Short Circuit Test Figure 44 — Output Ripple 24 VIN, 2.5 VOUT at 10 A Switching Frequency vs. Load Current 1.6 Frequency (MHz) 1.4 1.2 1.0 17.4 Vin 24 Vin 36 Vin 0.8 0.6 0.4 0.2 0.0 1 2 3 4 5 6 7 8 Load Curent (A) Figure 42 — Switching Frequency vs. Load Current Figure 45 — Output Ripple 24 VIN, 2.5 VOUT at 5 A Cool-Power® Rev 1.8 vicorpower.com Page 26 of 41 09/2015 800 927.9474 PI33xx-x0 PI3303-x0-LGIZ (12.0 VOUT) Electrical Characteristics Load Current vs. Ambient Temperature, 0 LFM 9.0 Load Current (A) 8.0 7.0 6.0 36 Vin 24 Vin 18 Vin 5.0 4.0 3.0 2.0 1.0 0.0 50 75 100 125 Ambient Temperature (°C) Figure 46 — Load Current vs. Ambient Temperature, 0 LFM Load Current vs. Ambient Temperature, 200 LFM 9.0 Load Current (A) 8.0 7.0 6.0 36 Vin 24 Vin 18 Vin 5.0 4.0 3.0 2.0 1.0 0.0 50 75 100 125 Ambient Temperature (°C) Figure 47 — Load Current vs. Ambient Temperature, 400 LFM Load Current vs. Ambient Temperature, 400 LFM 9.0 Load Current (A) 8.0 7.0 6.0 36 Vin 24 Vin 18 Vin 5.0 4.0 3.0 2.0 1.0 0.0 50 75 100 125 Ambient Temperature (°C) Figure 48 — Load Current vs. Ambient Temperature, 200 LFM Cool-Power® Rev 1.8 vicorpower.com Page 27 of 41 09/2015 800 927.9474 PI33xx-x0 PI3305-x0-LGIZ (15.0 VOUT) Electrical Characteristics Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 230 nH [1] Parameter Symbol Conditions Min Typ Max Unit 20.4 24 5.15 36 V mA 20 mA 1 mA mA V/µs Input Specifications Input Voltage Input Current Input Current At Output Short (fault condition duty cycle) VIN_DC IIN_DC [7] IIN_Short [2] Input Quiescent Current IQ_VIN Input Voltage Slew Rate VIN_SR Output Voltage Total Regulation Output Voltage Trim Range Line Regulation Load Regulation Output Voltage Ripple Continuous Output Current Range Current Limit VIN = 24 V, TC = 25°C, IOUT = 8 A Disabled Enabled (no load) 2.0 2.5 Output Specifications [2] VOUT_DC [3] [7] VOUT_DC VOUT (VIN) @25°C, 8 V <VIN <36 V VOUT (IOUT) @25°C, 0.5 A <IOUT <8 A VOUT_AC IOUT = 4 A, COUT = 4 x 22 µF, 20 MHz BW [4] [5] [7] IOUT_DC IOUT_CL Protection VIN UVLO Start Threshold VUVLO_START VIN UVLO Stop Threshold VUVLO_STOP VIN UVLO Hysteresis VUVLO_HYS VIN OVLO Start Threshold VOVLO_START VIN OVLO Stop Threshold VOVLO_STOP VIN OVLO Hysteresis VOVLO_HYS VIN UVLO/OVLO Fault Delay Time tf_DLY Number of the switching freq cycles VIN UVLO/OVLO Response Time tf Output Overvoltage Protection VOVP Above VOUT Over-Temperature Fault Threshold TOTP Over-Temperature Restart Hysteresis TOTP_HYS 14.78 10.0 15.0 15 0.1 0.1 60 15.23 16 8 9 18.4 17.4 37.0 36.1 130 19.4 18.4 0.90 38.4 0.77 128 500 20 135 30 20.4 19.4 140 V V % % mVp-p A A V V V V V V Cycles ns % °C °C [1] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4” dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. [2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [4] Refer to Output Ripple plots. [5] Refer to Load Current vs. Ambient Temperature curves. [6] Refer to Switching Frequency vs. Load current curves. [7] Minimum 5 V between VIN-Vout must be maintained or a minimum load of 1mA required. Cool-Power® Rev 1.8 vicorpower.com Page 28 of 41 09/2015 800 927.9474 PI33xx-x0 PI3305-x0-LGIZ (15.0 VOUT) Electrical Characteristics Unless otherwise specified: -55°C < TJ < 125°C, VIN =24 V, L1 = 230 nH [1] Parameter Symbol Conditions Min Typ Max Unit Timing Switching Frequency Fault Restart Delay fS tFR_DLY Synchronization Frequency Range SYNCI Threshold fSYNCI VSYNCI [6] 1.5 30 Sync In (SYNCI) Relative to set switching frequency [3] 50 MHz ms 110 2.5 % V Sync Out (SYNCO) SYNCO High SYNCO Low SYNCO Rise Time SYNCO Fall Time VSYNCO_HI VSYNCO_LO tSYNCO_RT tSYNCO_FT Source 1 mA Sink 1 mA 20 pF load 20 pF load 4.5 0.5 10 10 V V ns ns Soft Start And Tracking TRK Active Input Range TRK Max Output Voltage TRK Disable Threshold Charge Current (Soft – Start) Discharge Current (Fault) Soft-Start Time VTRK VTRK_OV ITRK ITRK_DIS tSS 0 20 -70 CTRK = 0 uF 1.04 1.2 40 -50 6.8 2.2 60 -30 V V mV µA mA ms 1.1 0.9 300 V V mV Enable High Threshold Low Threshold Threshold Hysteresis Enable Pull-Up Voltage (floating, unfaulted) Enable Pull-Down Voltage (floating, faulted) Source Current Sink Current VEN_HI VEN_LO VEN_HYS 0.9 0.7 100 1 0.8 200 VEN_PU 2 V VEN_PD 0 V IEN_SO IEN_SK -50 50 uA uA [1] All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI33xx-x0 evaluation board with 3x4” dimensions and 4 layer, 2 oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value. [2] Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control. [3] Output current capability may be limited and other performance may vary from electrical characteristics when switching frequency or VOUT is modified. [4] Refer to Output Ripple plots. [5] Refer to Load Current vs. Ambient Temperature curves. [6] Refer to Switching Frequency vs. Load current curves. [7] Minimum 5 V between VIN-VOUT must be maintained or a minimum load of 1mA required. Cool-Power® Rev 1.8 vicorpower.com Page 29 of 41 09/2015 800 927.9474 PI33xx-x0 PI3305-x0-LGIZ (15.0 VOUT) Electrical Characteristics Efficiency at 25°C 100 95 Efficiency 90 85 12 Vin 24 Vin 36 Vin 80 75 70 65 60 55 50 0 1 2 3 4 5 6 7 8 Load Curent (A) Figure 49 — Efficiency at 25°C Figure 52 — Transient Response 5 A to 10 A, at 5 A/µs Figure 50 — Short Circuit Test Figure 53 — Output Ripple 24 VIN, 2.5 VOUT at 10 A Switching Frequency vs. Load Current 1.6 Frequency (MHz) 1.4 1.2 1.0 20.4 Vin 24 Vin 36 Vin 0.8 0.6 0.4 0.2 0.0 1 2 3 4 5 6 7 8 Load Curent (A) Figure 51 — Switching Frequency vs. Load Current Figure 54 — Output Ripple 24 VIN, 2.5 VOUT at 5 A Cool-Power® Rev 1.8 vicorpower.com Page 30 of 41 09/2015 800 927.9474 PI33xx-x0 PI3305-x0-LGIZ (15.0 VOUT) Electrical Characteristics Load Current vs. Ambient Temperature, 0 LFM 9.0 Load Current (A) 8.0 7.0 6.0 36 Vin 24 Vin 21 Vin 5.0 4.0 3.0 2.0 1.0 0.0 50 75 100 125 Ambient Temperature (°C) Figure 55 — Load Current vs. Ambient Temperature, 0 LFM Load Current vs. Ambient Temperature, 200 LFM 9.0 Load Current (A) 8.0 7.0 6.0 36 Vin 24 Vin 21 Vin 5.0 4.0 3.0 2.0 1.0 0.0 50 75 100 125 Ambient Temperature (°C) Figure 56 — Load Current vs. Ambient Temperature, 400 LFM Load Current vs. Ambient Temperature, 400 LFM 9.0 Load Current (A) 8.0 7.0 6.0 36 Vin 24 Vin 21 Vin 5.0 4.0 3.0 2.0 1.0 0.0 50 75 100 125 Ambient Temperature (°C) Figure 57 — Load Current vs. Ambient Temperature, 200 LFM Cool-Power® Rev 1.8 vicorpower.com Page 31 of 41 09/2015 800 927.9474 PI33xx-x0 Functional Description The PI33xx-x0 is a family of highly integrated ZVS-Buck regulators. The PI33xx-x0 has a set output voltage that is trimmable within a prescribed range shown in Table 1. Performance and maximum output current are characterized with a specific external power inductor (see Table 4). L1 VIN VIN CIN PGND VOUT VS1 PI33xx VOUT COUT REM TRK SYNCO ADJ EN EAO SGND SYNCI Switching Frequency Synchronization The SYNCI input allows the user to synchronize the controller switching frequency by an external clock referenced to SGND. The external clock can synchronize the unit between 50% and 110% of the preset switching frequency (fS). For PI33xx-20 device versions only, the phase delay can be programmed via I2C bus with respect to the clock applied at SYNCI pin. Phase delay allows PI33xx-20 regulators to be paralleled and operate in an interleaving mode. The PI33xx-x0 default for SYNCI is to sync with respect to the falling edge of the applied clock providing 180° phase shift from SYNCO. This allows for the paralleling of two PI33xx-x0 devices without the need for further user programming or external sync clock circuitry. The user can change the SYNCI polarity to sync with the external clock rising edge via the I2C data bus (PI33xx-20 device versions only). When using the internal oscillator, the SYNCO pin provides a 5 V clock that can be used to sync other regulators. Therefore, one PI33xx-x0 can act as the lead regulator and have additional PI33xx-x0s running in parallel and interleaved. Figure 58 — ZVS-Buck with required components For basic operation, Figure 58 shows the connections and components required. No additional design or settings are required. ENABLE (EN) EN is the enable pin of the converter. The EN Pin is referenced to SGND and permits the user to turn the regulator on or off. The EN default polarity is a positive logic assertion. If the EN pin is left floating or asserted high, the converter output is enabled. Pulling EN pin below 0.8 Vdc with respect to SGND will disable the regulator output. The EN input polarity can be programmed (PI33xx-20 device versions only) via the I2C data bus. When the EN pin polarity is programmed for negative logic assertion; and if the EN pin is left floating, the regulator output is enabled. Pulling the EN pin above 1.0 Vdc with respect to SGND, will disable the regulator output. Remote Sensing An internal 100 Ω resistor is connected between REM pin and VOUT pin to provide regulation when the REM connection is broken. Referring to Figure 58, it is important to note that L1 and COUT are the output filter and the local sense point for the power supply output. As such, the REM pin should be connected at COUT as the default local sense connection unless remote sensing to compensate additional distribution losses in the system. The REM pin should not be left floating. Soft-Start The PI33xx-x0 includes an internal soft-start capacitor to ramp the output voltage in 2 ms from 0 V to full output voltage. Connecting an external capacitor from the TRK pin to SGND will increase the start-up ramp period. See, “Soft Start Adjustment and Track,” in the Applications Description section for more details. Output Voltage Trim The PI33xx-x0 output voltage can be trimmed up from the preset output by connecting a resistor from ADJ pin to SGND and can be trimmed down by connecting a resistor from ADJ pin to VOUT. The Table 1 defines the voltage ranges for the PI33xx-x0 family. Device Output Voltage Set Range PI3311-x0-LGIZ 1.0 V 1.0 to 1.4 V PI3318-x0-LGIZ 1.8 V 1.4 to 2.0 V PI3312-x0-LGIZ 2.5 V 2.0 to 3.1 V PI3301-x0-LGIZ 3.3 V 2.3 to 4.1 V PI3302-x0-LGIZ 5.0 V 3.3 to 6.5 V PI3303-x0-LGIZ 12 V 6.5 to 13.0 V PI3305-x0-LGIZ 15 V 10.0 to 16.0 V Table 1 — PI33xx-x0 family output voltage range Cool-Power® Rev 1.8 vicorpower.com Page 32 of 41 09/2015 800 927.9474 PI33xx-x0 Output Current Limit Protection PI33xx-x0 has two methods implemented to protect from output short or over current condition. Slow Current Limit protection: prevents the output load from sourcing current higher than the regulator’s maximum rated current. If the output current exceeds the Current Limit (IOUT_CL) for 1024 us, a slow current limit fault is initiated and the regulator is shutdown which eliminates output current flow. After Fault Restart Delay (tFR_DLY), a soft-start cycle is initiated. This restart cycle will be repeated indefinitely until the excessive load is removed. Fast Current Limit protection: PI33xx-x0 monitors the regulator inductor current pulse-by-pulse to prevent the output from supplying very high current due to sudden low impedance short (50 A Typical). If the regulator senses a high inductor current pulse, it will initiate a fault and stop switching until Fault Restart Delay ends and then initiate a soft-start cycle. Both the Fast and Slow current limit faults are stored in a Fault Register and can be read and cleared (PI33xx-20 device versions only) via I2C data bus. Input Undervoltage Lockout If VIN falls below the input Undervoltage Lockout (UVLO) threshold, but remains high enough to power the internal bias supply, the PI33xx-x0 will complete the current cycle and stop switching. If VIN recovers within 128 switching cycles, the PI33xx-x0 will resume normal operation. If this time limit is exceeded, the system will enter a low power state and initiate a fault. The system will restart once the input voltage is reestablished and after the Fault Restart Delay. A UVLO fault is stored in a Fault Register and can be read and cleared (PI33xx-20 device versions only) via I2C data bus. Input Overvoltage Lockout If VIN exceeds the input Overvoltage Lockout (OVLO) threshold (VOVLO), while the controller is running, the PI33xx-x0 will complete the current cycle and stop switching. If VIN recovers within 128 switching cycles, the PI33xx-x0 will resume normal operation. Otherwise, the system will enter a low power state and sets an OVLO fault. The system will resume operation when the input voltage falls below 98% of the OVLO threshold and after the Fault Restart Delay. The OVLO fault is stored in a Fault Register and can be read and cleared (PI33xx-20 device versions only) via I2C data bus. Output Overvoltage Protection The PI33xx-x0 family is equipped with output Overvoltage Protection (OVP) to prevent damage to input voltage sensitive devices. If the output voltage exceeds 20% of its set regulated value, the regulator will complete the current cycle, stop switching and issue an OVP fault. The system will resume operation once the output voltage falls below the OVP threshold and after Fault Restart Delay. The OVP fault is stored in a Fault Register and can be read and cleared (PI33xx-20 device versions only) via I2C data bus. Overtemperature Protection The internal package temperature is monitored to prevent internal components from reaching their thermal maximum. If the Over Temperature Protection Threshold (OTP) is exceeded (TOTP), the regulator will complete the current switching cycle, enter a low power mode, set a fault flag, and will soft-start when the internal temperature falls below OverTemperature Restart Hysteresis (TOTP_HYS). The OTP fault is stored in a Fault Register and can be read and cleared (PI33xx-20 device versions only) via I2C data bus. Pulse Skip Mode (PSM) PI33xx-x0 features a PSM to achieve high efficiency at light loads. The regulators are setup to skip pulses if EAO falls below a PSM threshold. Depending on conditions and component values, this may result in single pulses or several consecutive pulses followed by skipped pulses. Skipping cycles significantly reduces gate drive power and improves light load efficiency. The regulator will leave PSM once the EAO rises above the Skip Mode threshold. Variable Frequency Operation Each PI33xx-x0 is preprogrammed to a base operating frequency, with respect to the power stage inductor (see Table 4), to operate at peak efficiency across line and load variations. At low line and high load applications, the base frequency will decrease to accommodate these extreme operating ranges. By stretching the frequency, the ZVS operation is preserved throughout the total input line voltage range therefore maintaining optimum efficiency. Parallel Operation Paralleling modules can be used to increase the output current capability of a single power rail and reduce output voltage ripple. L1 VIN VIN CIN R1 VS1 VOUT VOUT COUT PGND PGD PI33xx (#1) REM SYNCI SYNCO(#2) SYNCI(#2) EN(#2) SYNCO EN EAO(#2) EAO TRK(#2) TRK SGND L1 VIN VIN CIN VOUT PGND PGD SYNCO(#1) SYNCI(#1) EN(#1) VS1 SYNCI PI33xx (#2) REM SYNCO EN EAO(#1) EAO TRK(#1) TRK SGND Figure 59 — PI33xx-x0 parallel operation Cool-Power® Rev 1.8 vicorpower.com Page 33 of 41 09/2015 800 927.9474 COUT PI33xx-x0 The PI33xx-x0 default for SYNCI is to sync with respect to the falling edge of the applied clock providing 180° phase shift from SYNCO. This allows for the paralleling of two PI33xx-x0 devices without the need for further user programming or external sync clock circuitry. The user can change the SYNCI polarity to sync with the external clock rising edge via the I2C data bus (PI33xx-20 device versions only). By connecting the EAO pins and SGND pins of each module together the units will share the current equally. When the TRK pins of each unit are connected together, the units will track each other during soft-start and all unit EN pins have to be released to allow the units to start (See Figure 59). Also, any fault event in any regulator will disable the other regulators. The two regulators will be out of phase with each other reducing output ripple (refer to Switching Frequency Synchronization). To provide synchronization between regulators over the entire operational frequency range, the Parallel Good (PGD) pin must be connected to the lead regulator’s (#1) SYNCI pin and a 2.5 kΩ Resistor, R1, must be placed between SYNCO (#2) return and the lead regulator’s SYNCI (#1) pin, as shown in Figure 59. In this configuration, at system soft-start, the PGD pin pulls SYNCI low forcing the lead regulator to initialize the open-loop startup synchronization. Once the regulators reach regulation, SYNCI is released and the system is now synchronized in a closed-loop configuration which allows the system to adjust, on the fly, when any of the individual regulators begin to enter variable frequency mode in the loop. Multi-phasing three regulators is possible (PI33xx-20 only) with no change to the basic single-phase design. For more information about how to program phase delays within the regulator, please refer to Picor application note PI33xx-2x Multi-Phase Design Guide. Application Description Output Voltage Trim The PI33xx-x0 family of Buck Regulators provides seven common output voltages: 1.0 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V, 12 V and 15 V. A post-package trim step is implemented to offset any resistor divider network errors ensuring maximum output accuracy. With a single resistor connected from the ADJ pin to SGND or REM, each device’s output can be varied above or below the nominal set voltage (with the exception of the PI3311-X0 which can only be above the set voltage of 1 V). Output Voltage Device Set Range PI3311-x0-LGIZ 1.0 V 1.0 to 1.4 V PI3318-x0-LGIZ 1.8 V 1.4 to 2.0 V PI3312-x0-LGIZ 2.5 V 2.0 to 3.1 V PI3301-x0-LGIZ 3.3 V 2.3 to 4.1 V PI3302-x0-LGIZ 5.0 V 3.3 to 6.5 V PI3303-x0-LGIZ 12 V 6.5 to 13.0 V PI3305-x0-LGIZ 15 V 10.0 to 16.0 V Table 2 — PI33xx-x0 family output voltage range The remote pin (REM) should always be connected to the VOUT pin, if not used, to prevent an output voltage offset. Figure 60 shows the internal feedback voltage divider network. I2C Interface Operation PI33xx-20 devices provide an I2C digital interface that enables the user to program the EN pin polarity (from high to low assertion) and switching frequency synchronization phase/delay. These are one time programmable options to the device. VOUT R4 REM Also, the PI33xx-20 devices allow for dynamic VOUT margining via I2C that is useful during development (settings stored in volatile memory only and not retained by the device). The PI33xx-20 also have the option for fault telemetry including: Rlow R1 ADJ + Rhigh R2 • • • • • 1.0 Vdc Fast/Slow current limit Output voltage high Input overvoltage Input undervoltage Over temperature protection SGND Figure 60 — Internal resistor divider network For more information about how to utilize the I2C interface please refer to Picor application note PI33xx-2x I2C Digital Interface Guide. R1, R2, and R4 are all internal 1.0 % resistors and Rlow and Rhigh are external resistors for which the designer can add to modify VOUT to a desired output. The internal resistor value for each regulator is listed below in Table 3. Cool-Power® Rev 1.8 vicorpower.com Page 34 of 41 09/2015 800 927.9474 PI33xx-x0 Device R1 R2 R4 PI3311-x0-LGIZ 1k Open 100 PI3318-x0-LGIZ 0.806 k 1.0 k 100 PI3312-x0-LGIZ 1.5 k 1.0 k 100 PI3301-x0-LGIZ 2.61 k 1.13 k 100 PI3302-x0-LGIZ 4.53 k 1.13 k 100 PI3303-x0-LGIZ 11.0 k 1.0 k 100 PI3305-x0-LGIZ 14.0 k 1.0 k 100 Table 3 — PI33xx-x0 Internal divider values By choosing an output voltage value within the ranges stated in Table 2, VOUT can simply be adjusted up or down by selecting the proper Rhigh or Rlow value, respectively. The following equations can be used to calculate Rhigh and Rlow values: slope is controlled by an internal 100 nF and a fixed charge current to provide a minimum startup time of 2 ms (typical) for all PI33xx-x0 regulators. By adding an additional external capacitor to the TRK pin, the soft-start time can be increased further. The following equation can be used to calculate the proper capacitor for a desired soft-start times: CTRK = (tTRK x ITRK) – 100 x 10 -9, Where, tTRK is the soft-start time and ITRK is a 50 uA internal charge current (see Electrical Characteristics for limits). There is typically either proportional or direct tracking implemented within a design. For proportional tracking between several regulators at startup, simply connect all devices TRK pins together. This type of tracking will force all connected regulators to startup and reach regulation at the same time (see Figure 61(a). VOUT 1 VOUT 2 (a) Master VOUT VOUT 2 If, for example, a 4.0 V output is needed, the user should choose the regulator with a trim range covering 4.0 V from Table 2. For this example, the PI3301 is selected (3.3 V set voltage). First step would be to use Equation (1) to calculate Rhigh since the required output voltage is higher than the regulator set voltage. The resistor-divider network values for the PI3301 are can be found in Table 3 and are R1 = 2.61 kΩ and R2 = 1.13 kΩ. Inserting these values in to Equation (1), Rhigh is calculated as follows: (b) + Figure 61 — PI33xx-x0 tracking methods For Direct Tracking, choose the regulator with the highest output voltage as the master and connect the master to the TRK pin of the other regulators through a divider (Figure 62) with the same ratio as the slave’s feedback divider (see Table 3 for values). Master VOUT Resistor R_high should be connected as shown in Figure 60 to achieve the desired 4.0 V regulator output. No external R_low resistor is need in this design example since the trim is above the regulator set voltage. PI33xx TRK Slave The PI3420 output voltage can only be trimmed higher than the factory 1 V setting. The following Equation (3) can be used calculate Rhigh values for the PI3420 regulators. R1 R2 SGND Figure 62 — Voltage divider connections for direct tracking Soft-Start Adjust and Tracking The TRK pin offers a means to increase the regulator’s softstart time or to track with additional regulators. The soft-start All connected regulators’ soft-start slopes will track with this method. Direct tracking timing is demonstrated in Figure 61(b). All tracking regulators should have their Enable (EN) pins connected together to work properly. Cool-Power® Rev 1.8 vicorpower.com Page 35 of 41 09/2015 800 927.9474 PI33xx-x0 depending upon line and load conditions. Inductor Pairing The PI33xx-x0 utilizes an external inductor. This inductor has been optimized for maximum efficiency performance. Table 4 details the specific inductor value and part number utilized for each PI33xx-x0 device which are available from Coiltronics and Eaton. Data sheets are available at: http://www.cooperindustries.com Device Inductor [nH] Inductor Part Number Manufacturer PI3311-x0 125 FPV1006-125-R Eaton PI3318-x0 150 FPV1006-150-R Eaton PI3312-x0 200 FPT705-200-R Coiltronics PI3301-x0 200 FPT705-200-R Coiltronics PI3302-x0 200 FPT705-200-R Coiltronics PI3303-x0 230 FPT705-230-R Coiltronics PI3305-x0 230 FPT705-230-R Coiltronics Thermal measurements were made using a standard PI33xx-x0 Evaluation board which is 3 x 4 inches in area and uses 4-layer, 2 oz copper. Thermal measurements were made on the three main power devices, the two internal MOSFETs and the external inductor, with air flows of 0, 200, and 400 LFM. Filter Considerations The PI33xx-x0 requires input bulk storage capacitance as well as low impedance ceramic X5R input capacitors to ensure proper start up and high frequency decoupling for the power stage. The PI33xx-x0 will draw nearly all of the high frequency current from the low impedance ceramic capacitors when the main high side MOSFET is conducting. During the time the high side MOSFET is off, they are replenished from the bulk capacitor. If the input impedance is high at the switching frequency of the converter, the bulk capacitor must supply all of the average current into the converter, including replenishing the ceramic capacitors. This value has been chosen to be 100 μF so that the PI33xx-x0 can start up into a full resistive load and supply the output capacitive load with the default minimum soft start capacitor when the input source impedance is 50 Ohms at 1 MHz. The ESR for this capacitor should be approximately 20 mΩ. The RMS ripple current in this capacitor is small, so it should not be a concern if the input recommended ceramic capacitors are used. Table 5 shows the recommended input and output capacitors to be used for the various models as well as expected transient response, RMS ripple currents per capacitor, and input and output ripple voltages. Table 6 includes the recommended input and output ceramic capacitors. Table 4 — PI33xx-x0 Inductor pairing Thermal Derating Thermal de-rating curves are provided that are based on component temperature changes versus load current, input voltage and air flow. It is recommended to use these curves as a guideline for proper thermal de-rating. These curves represent the entire system and are inclusive to both the Picor regulator and the external inductor. Maximum thermal operation is limited by either the MOSFETs or inductor Device VIN (V) PI3311 24 PI3318 24 PI3312 24 PI3301 24 PI3302 24 PI3303 24 PI3305 24 ILOAD (A) 10 5 10 5 CINPUT Ceramic X5R CINPUT Bulk Elec. COUTPUT Ceramic X5R CINPUT Ripple Current (IRMS) COUTPUT Ripple Current (IRMS) 4 x 4.7 µF 50 V 100 µF 50 V 8 X 100 µF 2 X 1 µF 1 X 0.1 µF 0.5 0.8 4 x 4.7 µF 50 V 100 µF 50 V 6 X 100 µF 2 X 1 µF 1 X 0.1 µF 0.5 0.8 4 x 4.7 µF 100 µF 50 V 4 X 100 µF 2 X 1 µF 1 X 0.1 µF 1 1.75 4 x 4.7 µF 100 µF 50 V 4 X 100 µF 2 X 1 µF 1 X 0.1 µF 1.05 1.625 4 x 4.7 µF 100 µF 50 V 4 X 47 µF 2 X 1 µF 1 X 0.1 µF 1.2 1.5 4 x 4.7 µF 100 µF 50 V 4 X 22 µF 2 X 1 µF 1 X 0.1 µF 1.3 1.36 4 x 4.7 µF 100 µF 50 V 4 X 22 µF 2 X 1 µF 1 X 0.1 µF 1.38 1.2 10 5 10 5 10 5 8 4 8 4 Input Ripple (mVpp) Output Ripple (mVpp) 120 20 100 15 120 20 100 15 150 50 100 24 200 40 125 33 220 50 140 30 275 100 150 60 280 150 160 75 Table 5 — Recommended input and output capacitance Cool-Power® Rev 1.8 vicorpower.com Page 36 of 41 09/2015 800 927.9474 Output Ripple (mVpp) Recovery Time (µs) Load Step (A) (Slew/µs) -/+40 40 5 (5 A/µs) -/+40 40 5 (5 A/µs) -/+80 25 5 (10 A/µs) -/+100 20 5 (1 0A/µs) -/+170 30 5 (5 A/µs) -/+300 30 4 (10 A/µs) -/+400 30 4 (10 A/µs) PI33xx-x0 MURATA PART NUMBER DESCRIPTION GRM188R71C105KA12D 1uF 16V 0603 X7R GRM319R71H104KA01D 0.1uF 50V 1206 X7R GRM31CR60J107ME39L 100uF 6.3V 1206 X5R GRM31CR71H475KA12K 4.7uF 50V 1206 X7R GRM31CR61A476ME15L 47uF 10V 1206 X5R GRM31CR61E226KE15L 22uF 25V 1206 X5R When Q1 is on and Q2 is off, the majority of CIN’s current is used to satisfy the output load and to recharge the COUT capacitors. When Q1 is off and Q2 is on, the load current is supplied by the inductor and the COUT capacitor as shown in Figure 65. During this period CIN is also being recharged by the VIN. Minimizing CIN loop inductance is important to reduce peak voltage excursions when Q1 turns off. Also, the difference in area between the CIN loop and COUT loop is vital to minimize switching and GND noise. Table 6 — Capacitor manufacturer part numbers Layout Guidelines I CNV NV To optimize maximum efficiency and low noise performance from a PI33xx-x0 design, layout considerations are necessary. Reducing trace resistance and minimizing high current loop returns along with proper component placement will contribute to optimized performance. A typical buck converter circuit is shown in Figure 63. The potential areas of high parasitic inductance and resistance are the circuit return paths, shown as LR below. COUT Figure 65 — Current flow: Q2 closed The recommended component placement, shown in Figure 66, illustrates the tight path between CIN and COUT (and VIN and VOUT) for the high AC return current. This optimized layout is used on the PI33xx-x0 evaluation board. VIN VOUT Figure 63 — Typical Buck Converter COUT GND The path between the COUT and CIN capacitors is of particular importance since the AC currents are flowing through both of them when Q1 is turned on. CIN VSW VIN Figure 64, schematically, shows the reduced trace length between input and output capacitors. The shorter path lessens the effects that copper trace parasitics can have on the PI33xx-x0 performance. I NV GND Figure 66 — Recommended component placement and metal routing CNV Figure 67 details the recommended receiving footprint for PI33xx-x0 10 mm x 14 mm package. All pads should have a final copper size of 0.55 mm x 0.55 mm, whether they are solder-mask defined or copper defined, on a 1 mm x 1 mm grid. All stencil openings are 0.45mm when using either a COUT Figure 64 — Current flow: Q1 closed Cool-Power® Rev 1.8 vicorpower.com Page 37 of 41 09/2015 800 927.9474 PI33xx-x0 Recommended PCB Footprint and Stencil Figure 67 — Recommended Receiving PCB footprint Cool-Power® Rev 1.8 vicorpower.com Page 38 of 41 09/2015 800 927.9474 PI33xx-x0 Package Drawings DIMESIONAL REFERENCES REF. MIN NOM 2.50 2.56 A A1 A2 0.50 0.55 b L 0.50 0.55 14.00 BSC D 10.00 BSC E 13.00 BSC D1 E1 9.00 BSC e 1.00 BSC 0.10 0.15 L1 aaa bbb ccc ddd eee Cool-Power® Rev 1.8 vicorpower.com Page 39 of 41 09/2015 800 927.9474 MAX 2.62 0.05 2.57 0.60 0.60 0.20 0.10 0.10 0.08 0.10 0.08 PI33xx-x0 Revision History Revision Date 1.5 06/13 1.6 Description Page Number(s) Last release in old format n/a 08/03/15 Reformatted in new template n/a 1.7 08/21/15 Formatting edits 6, 21, 22, 25, 26, 29, 30, 36 1.8 09/??/15 Formatting edits 6, 21, 22, 25, 26, 29, 30, 36 Cool-Power® Rev 1.8 vicorpower.com Page 40 of 41 09/2015 800 927.9474 PI33xx-x0 Vicor’s comprehensive line of power solutions includes high density AC-DC and DC-DC modules and accessory components, fully configurable AC-DC and DC-DC power supplies, and complete custom power systems. Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for its use. 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Intellectual Property Notice Vicor and its subsidiaries own Intellectual Property (including issued U.S. and Foreign Patents and pending patent applications) relating to the products described in this data sheet. No license, whether express, implied, or arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Interested parties should contact Vicor's Intellectual Property Department. The products described on this data sheet are protected by the following U.S. Patents Numbers: 6,788,033; 7,154,250; 7,561,446; 7,361,844; D496,906; D506,438; 6,940,013; 7,038,917; 6,969,909; 7,166,898; 6,421,262; 7,368,957; RE 40,072 Vicor Corporation 25 Frontage Road Andover, MA 01810 USA Picor Corporation 51 Industrial Drive North Smithfield, RI 02896 USA email Customer Service: [email protected] Technical Support: [email protected] Cool-Power® Rev 1.8 vicorpower.com Page 41 of 41 09/2015 800 927.9474